In D&D 5e character building or optimization is a substantial part of the game for a decent part of the player base. Often, there are several ways to achieve a certain goal, for example, I want to ask a question along the lines of:
How can I raise my AC without wearing armor? dnd-5eoptimization
From my decent knowledge of the rules, I expect a list of less than ten features, which are either part of a class, race, spell, item, or class-less feat. To me that seems not too broad, but I have had negative reactions to similar questions (which had similarly concise answers) in the past. I could imagine creating a community-wiki answer, so that if new material gets published and a new feature would have to be included, anyone could add it in.